httpx.ConnectError: EOF occurred in violation of protocol (_ssl.c:1131)

[jekoie]

I try to use bellow code run httpx, but it run as error?

import httpx
r = httpx.get('https://httpbin.org/get')
print(r)

** The Error**

PS E:\test> & C:/Users/jekoi/AppData/Local/Programs/Python/Python38/python.exe e:/test/t6.py
Traceback (most recent call last):
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpcore\_exceptions.py", line 10, in map_exceptions
    yield
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpcore\_backends\sync.py", line 62, in start_tls
    raise exc
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpcore\_backends\sync.py", line 57, in start_tls
    sock = ssl_context.wrap_socket(
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\ssl.py", line 500, in wrap_socket
    return self.sslsocket_class._create(
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\ssl.py", line 1040, in _create
    self.do_handshake()
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\ssl.py", line 1309, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLEOFError: EOF occurred in violation of protocol (_ssl.c:1131)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpx\_transports\default.py", line 60, in map_httpcore_exceptions
    yield
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpx\_transports\default.py", line 218, in handle_request
    resp = self._pool.handle_request(req)
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpcore\_sync\connection_pool.py", line 262, in handle_request
    raise exc
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpcore\_sync\connection_pool.py", line 245, in handle_request
    response = connection.handle_request(request)
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpcore\_sync\http_proxy.py", line 271, in handle_request
    connect_response = self._connection.handle_request(
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpcore\_sync\connection.py", line 92, in handle_request
    raise exc
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpcore\_sync\connection.py", line 69, in handle_request
    stream = self._connect(request)
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpcore\_sync\connection.py", line 149, in _connect
    stream = stream.start_tls(**kwargs)
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpcore\_backends\sync.py", line 62, in start_tls
    raise exc
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\contextlib.py", line 131, in __exit__
    self.gen.throw(type, value, traceback)
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpcore\_exceptions.py", line 14, in map_exceptions
    raise to_exc(exc) from exc
httpcore.ConnectError: EOF occurred in violation of protocol (_ssl.c:1131)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "e:/test/t6.py", line 3, in <module>
    r = httpx.get('https://httpbin.org/get')
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpx\_api.py", line 189, in get
    return request(
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpx\_client.py", line 814, in request
    return self.send(request, auth=auth, follow_redirects=follow_redirects)
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpx\_client.py", line 901, in send
    response = self._send_handling_auth(
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpx\_client.py", line 929, in _send_handling_auth
    response = self._send_handling_redirects(
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpx\_client.py", line 966, in _send_handling_redirects
    response = self._send_single_request(request)
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpx\_client.py", line 1002, in _send_single_request
    response = transport.handle_request(request)
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpx\_transports\default.py", line 218, in handle_request
    resp = self._pool.handle_request(req)
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\contextlib.py", line 131, in __exit__
    self.gen.throw(type, value, traceback)
  File "C:\Users\jekoi\AppData\Local\Programs\Python\Python38\lib\site-packages\httpx\_transports\default.py", line 77, in map_httpcore_exceptions
    raise mapped_exc(message) from exc
httpx.ConnectError: EOF occurred in violation of protocol (_ssl.c:1131)
PS E:\test>
PS E:\test> pip show httpx
Name: httpx
Version: 0.24.1
Summary: The next generation HTTP client.
Home-page:
Author:
Author-email: Tom Christie <tom@tomchristie.com>
License:
Location: c:\users\jekoi\appdata\local\programs\python\python38\lib\site-packages
Requires: certifi, httpcore, idna, sniffio
Required-by:
PS E:\test> 

[lovelydinosaur]

Not replicating here...

>>> import httpx
>>> r = httpx.get('https://httpbin.org/get')
>>> print(r)
<Response [200 OK]>

But... you'd be seeing that exception because the server's disconnected during the SSL handshake.

Useful prompts to us...

• Can we present a clearer exception here?
• Are we able to setup a reliable reproduction of this case?
• What exception chain would requests show to a user here?

[jekoie]

Throw this error is I switch clash for windows(proxy tool) on.But I use requests had no problem.Can you let httpx can use when proxy tool opened.

[guhuajun]

Throw this error is I switch clash for windows(proxy tool) on.But I use requests had no problem.Can you let httpx can use when proxy tool opened.

I am using clash too, you can use no_proxy to by pass your test domains.

[arynyklas]

@tomchristie, problem still exists.
Tested on py3.10.11 and py3.10.13, same error:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/httpcore/_exceptions.py", line 10, in map_exceptions
    yield
  File "/usr/local/lib/python3.10/dist-packages/httpcore/_backends/sync.py", line 62, in start_tls
    raise exc
  File "/usr/local/lib/python3.10/dist-packages/httpcore/_backends/sync.py", line 57, in start_tls
    sock = ssl_context.wrap_socket(
  File "/usr/lib/python3.10/ssl.py", line 513, in wrap_socket
    return self.sslsocket_class._create(
  File "/usr/lib/python3.10/ssl.py", line 1104, in _create
    self.do_handshake()
  File "/usr/lib/python3.10/ssl.py", line 1375, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLEOFError: EOF occurred in violation of protocol (_ssl.c:1007)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/httpx/_transports/default.py", line 60, in map_httpcore_exceptions
    yield
  File "/usr/local/lib/python3.10/dist-packages/httpx/_transports/default.py", line 218, in handle_request
    resp = self._pool.handle_request(req)
  File "/usr/local/lib/python3.10/dist-packages/httpcore/_sync/connection_pool.py", line 262, in handle_request
    raise exc
  File "/usr/local/lib/python3.10/dist-packages/httpcore/_sync/connection_pool.py", line 245, in handle_request
    response = connection.handle_request(request)
  File "/usr/local/lib/python3.10/dist-packages/httpcore/_sync/connection.py", line 92, in handle_request
    raise exc
  File "/usr/local/lib/python3.10/dist-packages/httpcore/_sync/connection.py", line 69, in handle_request
    stream = self._connect(request)
  File "/usr/local/lib/python3.10/dist-packages/httpcore/_sync/connection.py", line 149, in _connect
    stream = stream.start_tls(**kwargs)
  File "/usr/local/lib/python3.10/dist-packages/httpcore/_backends/sync.py", line 54, in start_tls
    with map_exceptions(exc_map):
  File "/usr/lib/python3.10/contextlib.py", line 153, in __exit__
    self.gen.throw(typ, value, traceback)
  File "/usr/local/lib/python3.10/dist-packages/httpcore/_exceptions.py", line 14, in map_exceptions
    raise to_exc(exc) from exc
httpcore.ConnectError: EOF occurred in violation of protocol (_ssl.c:1007)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "test.py", line 187, in <module>
    r = http_client.get(
  File "/usr/local/lib/python3.10/dist-packages/httpx/_client.py", line 1041, in get
    return self.request(
  File "/usr/local/lib/python3.10/dist-packages/httpx/_client.py", line 814, in request
    return self.send(request, auth=auth, follow_redirects=follow_redirects)
  File "/usr/local/lib/python3.10/dist-packages/httpx/_client.py", line 901, in send
    response = self._send_handling_auth(
  File "/usr/local/lib/python3.10/dist-packages/httpx/_client.py", line 929, in _send_handling_auth
    response = self._send_handling_redirects(
  File "/usr/local/lib/python3.10/dist-packages/httpx/_client.py", line 966, in _send_handling_redirects
    response = self._send_single_request(request)
  File "/usr/local/lib/python3.10/dist-packages/httpx/_client.py", line 1002, in _send_single_request
    response = transport.handle_request(request)
  File "/usr/local/lib/python3.10/dist-packages/httpx/_transports/default.py", line 217, in handle_request
    with map_httpcore_exceptions():
  File "/usr/lib/python3.10/contextlib.py", line 153, in __exit__
    self.gen.throw(typ, value, traceback)
  File "/usr/local/lib/python3.10/dist-packages/httpx/_transports/default.py", line 77, in map_httpcore_exceptions
    raise mapped_exc(message) from exc
httpx.ConnectError: EOF occurred in violation of protocol (_ssl.c:1007)

[lovelydinosaur]

Could you be more descriptive?...

• Which URL are you accessing.
• Are you seeing the connection error occasionally or consistently.

It's looks like a valid connection error which is occuring due to the connection being closed during the SSL handshake. Perhaps there's better error messaging that we could be providing here, but it'd help if we've a replicable example against a public URL.